Henry Keyes Jordan

“ As an example of the effects of a water-current, the author stated that at a colliery in the Forest of Dean the "Coleford-Hill-Delf " seam, which had a thickness of about 5 feet, was in one part of the colliery found to be entirely "washed out," the sandstone roof resting directly upon the underclay. In an adjoining area the coal was from 8 to 12 feet thick; and the author was of opinion that the coal, after its formation, but before the deposition of the roofing sandstone, had been entirely removed from one locality and piled up in the other by the action of a strong current of water. ”

“ When these "coal-conglomerates" are found without any coal-seam immediately beneath them, the author infers that the seams from which they were derived have been entirely broken up, and converted into pebbles and fine detritus, the characters of the pebbles and the friability of the material of which they are composed being, he thinks, incompatible with the notion of their having been transported from a distance. ”

“ The author instanced the sandstone forming the roof of the "Rock Fawr" seam near Bridgend as containing in some areas very large quantities of detrital coal and coal-pebbles up to the size of a hen's egg; and these pebbles, which consist, of the same coal as that in the seam below, have their angles but slightly rounded. In some seams the coal is overlain by thin beds of shale, coal, and fire-clay, upon which the roof of the seam reposes ”